The Chihuahua, the smallest dog in the world, is named after the state of Chihuahua in Mexico and is believed by some to have been a sacred dog of the Aztecs. However, a dog not unlike the Chihuahua may well have existed in Egypt some 3,000 years ago. In 1910, a zoologist found the mummified remains of a little dog in an Egyptian tomb that had the soft spot in the skull that is common in the breed. Chihuahuas have been known in Malta for many centuries, having arrived there from North Africa around 600 BC, and a Botticelli fresco (c.1482) in the Sistine Chapel in Rome includes the likeness of a Chihuahua. There are two varieties of Chihuahua: the Smooth-coated and Long-coated, the latter having long hair of soft texture that is either flat or slightly wavy. The Chihuahua is an exceedingly intelligent dog that is affectionate, possessive, and makes a good watchdog in miniature. Despite being generally thought of as a lapdog, it can walk as far as most owners would wish. Care must be taken on outings that it does not start a fight because it seems to imagine that it is enormous when confronted with other canines. The breed is expensive to keep, and both Long-haireds and Smooth-haireds are fairly easy to groom, requiring only daily combing and brushing with a soft brush.